Chronic Lymphocytic Leukemia Clinical Trial
Official title:
Use of Valproic Acid in Relapsed or Refractory Chronic Lymphocytic Leukemia
The purpose of this study is to determine whether Valproic acid, as a single agent is effective in the treatment of Chronic Lymphocytic Leukemia which has relapsed or is refractory to therapy with standard drugs.
Chronic lymphocytic leukemia (CLL) is a disease characterized by a prolonged clinical course. Though various drugs such as alkylating agents, antimetabolites such as fludarabine and targeted antibodies such as rituximab are effective against this condition, relapses are frequent and cure is rare. There exists a subset of CLL patients who are refractory to many of these first line agents. Though one or the other of the above mentioned class of drugs can be substituted for patients who have relapsed or have refractory disease, no therapy has been conclusively proven to have survival advantage in this condition. The costs and toxicities add to the burden of these therapies. Valproic acid is a well studied drug used for the treatment of epilepsy for over 30 years. It has a well documented side effect profile, is generally well tolerated and is inexpensive. Recently, it has been shown to be an inhibitor of the enzyme, Histone de-acetylase(HDAC). Inhibition of HDAC promotes apoptosis, and could lead to the death of CLL cells which harbor defective apoptotic mechanisms. In vitro studies have proven the ability of therapeutic concentrations of Valproic acid to achieve cell kill in cultures of CLL cells. This study aims to identify whether valproic acid, used in standard doses has single agent activity against CLL and to assess its tolerance in these patients. ;
Endpoint Classification: Safety/Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment
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